campbell



(No Model.) 2 Sheets-Sheet 1.

W. A. CAMPBELL.

FEED MECHANISM FOR SAW MILL GARRIAGES.

No. 324,223. Patented Aug. 11, 1885.

N. PETERS. PhotlrLilhogr-whar. Wishinginll, nfic (No Model.) 2Sheets-Sheet 2. W. A. CAMPBELL.

v FEED MECHANISM FOR SAW MILL GARRIAGES.

No. 324,223. Patented Aug.11, 1885.

v [xv-612202:- f/ep'i WZZZz'am am ale UNITED STATES PATENT OFFICE.

WILLIAM A. CAMPBELL, OF EAST SAGIN AW, MICHIGAN, ASSIGNOR OF ONE-HALF TOA. F. BARTLETT 8t 00., OF SAME PLACE.

FEED MECHANISM FOR SAW-MILL CARRIAGES.

SPECIFICATION forming part of Letters Patent No. 324,223, dated August11, 1885.

Application filed April 29, 1885.

T all whom it may concern.-

Be it known that I, WIL IAM A. CAMPBELL, of East Saginaw, in the countyof Saginaw and State of Michigan, have invented new and usefulImprovements in Reversible Feed- \Vorks for Circular-Paw Mills; and I dohereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,which form a part of this specification.

This invention relates to certain new and useful improvements in theconstruction of means to drive the carriage of a saw-mill where a rapidreverse motion of the carriage is required, as in mills where circularsaws are employed.

The invention consists in the peculiarities of construction of theparts, and their combinations and operation by means of which the usualwear upon the rope or cable employed is diminished to the minimum andthe friction decreased, as more fully hereinafter described.

Figure 1 is a plan view showing the carriage and the parts which give itits motion, the floor of the mill being removed in order to show therelative position of the parts. Fig. 2 is a side elevation, and Fig. 3is a detached perspective view,of the oscillating pulley.

In the drawings, A represents the floor of the mill,upon which is laidthe usual ways,B, upon which the carriage 0 travels. Supported in anysuitable manner below the floor,and at right-angles to the travel of thecarriage and between the two ends of the track B, is journaled the shaftD, to which are secured the spirally-grooved pulleys E.

F are two grooved sheaves, journaled in a suitable frame, G, and at bothends of these frames they are provided with journals or pintles a, whichrun in boxes b, these boxes being secured to suitable supports whichhold the frames in line with the travel of the carriage. A rope, S, isfastened at its center to the shaft H, and at each end to one of thepulleys E.

It will be noticed that the axis of the oscillation of the sheaves F isalways in line with the draft of the carriage C, while the sheaves arefree to adjust themselves to the plane in poses specified.

(No model.)

thereby preventing their chafing upon the edges of the grooves on thesheaves and on the drums, the latter being spirally grooved, the moreeasily to allow the rope in the rotation of the sheaves to follow thespiral and not allow any coil of such rope to ride upon its fellow. Theslack which o ccurs in the ropes from time to time is taken up byturning the shaft H, carrying a pinion, h. The shaft is secured to thecarriage and has the rope secured to it. A pawl, h, engages the pinion,and a crank,h allows the crank to be operated. The alignment of thoseparts of the ropes between the sheaves and the carriage is therebychanged; but with my oscillating sheaves the ropes will still run trueover the sheaves.

The space beneath the floor under the carriage is generally required forother machinery and is not available for placing the drums E E. Bygrooving them spirally and using the oscillating sheaves in connectionwith them I am now enabled to place them anywhere between the ends ofthe track, and can place them as far apart or as near together asconvenience will dictate, simply taking care to adjust the spiralgrooves to the angle of the ropes.

What I claim as my invention is- 1. In a saw-mill, substantially asdescribed, the combination, with a reciprocating carriage, of a sheave,as F, journaled in bearings in a rocking frame, and a rope passing oversaid sheave and operating said carriage, as set forth.-

2. In a saw-mill, the combination, with a reciprocating carriage and anoperating-rope connected therewith, of an oscillating oblong frameprovided with a pintle at each end, journaled in boxes secured to theframe of the machine, and a sheave journaled in said oscillating frame,substantially as and for the pur- WILLIAM A. CAMPBELL.

lVitnesses:

H. S. SPRAGUE, CHARLES J. HUNT.

